specs for this glass door roller

A contractor from santa barbara, ca. says:
hello, what is the weight capacity of one of the 81-149 tandom rollers? what size rail are they designed to run on? could you send me a spec. sheet? do you have track i can gang 4 sliding doors on? thanks, sean stevens
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Paul Sr. from SWISCO responded:
The weight capacity for the 81-149 replacement glass door roller is 110 lbs per roller. I included a new picture of the roller with this post so you can see closer detail of the wheel. This roller works well with the 80-105 and 80-106 sliding glass door tracks. Each sliding door track has one run and the longest one is the 80-105 which is 8' long.
Detailed view of the 81-149 replacement sliding door roller wheel.
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